(function () {
	var CookieObj = function () {
	}
	cookieObj = null ;
	CookieObj.prototype.setCookie = function(name,value)
	{
		var Days = 30;
		var exp = new Date();
		exp.setTime(exp.getTime() + Days*24*60*60*1000);
		document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
	}

	//读取cookies
	CookieObj.prototype.getCookie = function(name)
	{
		var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");

		if(arr=document.cookie.match(reg))

			return unescape(arr[2]);
		else
			return null;
	}

	//删除cookies
	CookieObj.prototype.delCookie = function (name)
	{
		var exp = new Date();
		exp.setTime(exp.getTime() - 1);
		var cval=this.getCookie(name);
		if(cval!=null)
			document.cookie= name + "="+cval+";expires="+exp.toGMTString();
	}
	cookieObj = new CookieObj();
})()
